What two statements are true about a "root" application module?

What two statements are true about a “root” application module?

A.
the lowest-level application module in a hierarchy of nested application modules

B.
an application module that delegates a separate database connection to any modules that it
contains

C.
an application module that contains nested application modules

D.
a nested application module

E.
an application module that manages the transaction context for any nested application modules

Explanation:
http://docs.oracle.com/cd/B14099_19/web.1012/b14022/oracle/jbo/ApplicationModule.html